Platen for type-writing machines.



No. 883,909. I PATENTED APR. 7, 1 908.

' E. O. PHILLIPS. I

PLATEN FOR TYPE WRITING MACHINES.

APPLICATION TILED JULY 15 1907.

irzaenzort' we-d 7 .w W W him W Structural arrangement and combination of UNITED STATES 1 :11am OFFICE.

ELWOOD C. PHILLIPS, OF CHICAGO, ILLINOIS, ASSIGNOR TO LEVI-P. THOMPSON, OF CINCINNATI, OHIO.

Specification of Letters Patent.

Patented April 7, 1908.

Application filed Ju1y.1 5, 1907. Serial No. 383,911.

To all whom it may concern:

Be it known that I, ELwooD O. PHILLIPs, a citizen of the United States of America, and a resident of Chicagdin the county of Cook'and State of Illinois, have invented certain new "and useful Improvements in Platens for Type-VVriting Machines, of-which the following isa specification.

This invention relates to cylindrical platens for type writing machines, andhas for its object to provide a simple and efficient parts forming an improved platen by means of which the noise produced by the impact of the type against such platen is eliminated to a very material extent, all as will herein after more fully appear.

In the accompanying drawings :Figure 1, is a longitudinal sectional elevationof a cylindrical platen embodying the present invention. Fig. 2, is'a detachedpers ective view of the inner tubular member 0 the same. Fig. 3, is a sectional elevation of one end of the platen. Fig. 4, is .a transverse section on line 4-4 Fig. ll

. parts in the several views. 3 0

Referring to the drawings, 1 represents the usual carrying shaft having an axial arrangement on the cylindrical laten, as usual.

2 and 3 are substantia ly counterpart end heads formed with external journal bearings 2 and 3 and secured to the shaft 1,

in any suitable manner and provided with internal cylindrical supportin flanges 5, formed with radial fastening holes 5? and the peripheries of which are concentric with the axis of the shaft 1, and are adapted to support the inner tubular member of the platen, hereinafter described 6 are marginal extensions forming the peripheries of the end heads 2 and .3; such extensions roject beyond the aforesaid supporting ,anges 5, to provide annular recesses 6 and maintain the hereinafter de-' scribed lastic filling in "lace. One of such marginal extensions, in the preferredconstruction as shown in Fig. -1, will have its periphery formed with a series of ratchet teet 7 for operative engagement by the usual manually actuated mechanism of a type writing machine, and by which a step Fig. 5, is a sec-. tional elevation of the other end of the by step rotation is given the platen inactual use of. the machine.-

8 is an inner. tubular member of an imperforate' cylindrical form between its open ends, with such open ends formed with'radial fastening holes 8 and adapted to fit over and be secured to the supporting flanges 5, aforesaid, by rivets or other bolts 4. Such member is formed of paper, paper, pulp or other like material, and its respective ends fit in the annular recesses 6 and abut the'inner member 8, so as to provide a circu-- lar space between the two members as shown in Figs. 1 and 4. i

10 is a filling of plastic material arranged in the aforesaid circular space between said members and adapted to connectthe two together in a firm-and substantial manner, and

' to such end such material will have an 'adhesive nature by the mixture therewith, or other suitable application of an adhesive.

The material part of the present invention consists in the employment, as such filling, of a suitable sound deadening material, such for instance as a mixture of glue, glycerin and sugar, so that the jar due to the impact of the type against the periphery of the platen, Will be absorbed and not transmitted to the supporting frame and other parts of the machine, in consequence of which the noise produced by such impacts is reduced to a minimum.

Having thus fully described my said in.

sion providing an annular recess around the sup orting flange, an inner tubular member of brous material having its ends provided with radial fastening holes're istering with the radial fastening holes of t e supporting flanges and fitting over the latter Within the I the Whole length of, and seeuring the latter annular recesses against the marginal extent0 ether, between the marginal extensions. 10 'sions, fastenings located in the radial fastenigned at- Chicago, Illinois, this 11th day ing holes for securing the inner tubular memof July '1907.

5 her to the flanges, an outer tubular member, .ELVVOOD C. PHILLIPS.

spaced from the inner tubular member, and Witnesses: a filling of sound deadening adhesive mate- S. A. PHILLIPS,

rialbet'ween the-tubular members extending J .A. BARKER. 

